Automotive lighting is an increasingly important differentiating factor, and automakers are always looking for innovative lighting solutions to make vehicles even more unique. This also brings a rare opportunity for the development of car lights.
Matrix LED headlights are composed of multiple lighting zones, and each lighting zone contains several LED lamp beads. Each lighting zone can be individually lit and controlled. The better the irradiation effect is, the more difficult the system is to control and the higher the cost.
Main features of matrix headlights
1. Avoid dazzling oncoming vehicles.
2. The longer exposure range makes driving safer: every additional 30 meters of exposure range can increase the response time by 1.3s.
3. The intelligence of the system can reduce the driver’s driving fatigue.
It has the following characteristics:
- Extreme anti-dazzle high beam function: 8 traffic participants can be blocked simultaneously 25 individually controllable zones per headlamp
- Detects vehicles up to 300-400 meters ahead
How Matrix LED Headlights Work
Mainly through the camera to identify the oncoming vehicle and the oncoming vehicle, in a fraction of a second by turning off or dimming the individual LEDs arranged in a matrix to change the light distribution (that is, to remove the light from the light beam to the preceding vehicle and the opposite vehicle. light from the car). Multiple channels can be opened simultaneously using this matrix technique.
Compared with ordinary LED headlights, matrix LED headlights can control the light source down to a specified lamp bead, while ordinary LED headlights can only control the entire group of LED lamp beads, which is not as functional and expandable. Matrix LED headlights.
It can be said that the matrix LED lights not only make the car look more cool, but also make driving at night safer!
Now it has developed to the matrix LED headlights with laser, which can also realize 8 lighting modes (suburban, high-speed, city, curve, enhanced curve, parking, energy saving, high beam full open). As matrix LED technology matures and costs drop, more and more car companies will join it to benefit traffic participants.
LED driver chip for matrix headlights
Behind such high-performance lights, matrix LED driver chips are indispensable. Here we briefly introduce several matrix LED driver chips.
1. NXP dual-channel step-down matrix LED driver chip
At present, the NXP LED driver chip can be expanded up to 12 channels, and the power ranges from 30W to 140W. All of them use the smaller HVQFN32 packaging process, which is convenient for development engineers to layout and reduces the overall PCB area.
ASL2416SHN is a dual-channel step-down LED driver chip for matrix LED lights, which can input constant DC power for LEDs.
2. TI high brightness matrix LED driver chip
With the rapid development of automotive lighting technology, TI has been committed to the development of innovative processes, packaging, and circuit design technologies. With its own advantages, TI has developed a variety of matrix LED driver chips for ultra-high power density in automotive lighting, suitable for AFS, ADB and High-resolution headlamp system to meet stringent EMC design requirements. In terms of channel control, it has been expanded to a maximum of 48 channels, which can realize a more precise control system.
TPS92663A-Q1 is a 6-channel, high-brightness matrix LED driver chip. The chip integrates 6 bypass switches, and there are two substrings in every 3 series switches. A single substring can also be connected to a single or multiple current sources at the same time. The on-resistance of the bypass switch is low, which can greatly reduce the loss. When the chip drives a specified lamp bead, it can bypass other lamp beads to achieve independent control.
3. ON dual-channel matrix LED driver chip
ON Semiconductor’s LED car headlight driver chip has been developed to the third generation, and its chip is widely used by Audi, Mercedes-Benz, BMW and other car companies.
NCV78763 is a dual-channel, high-efficiency and intelligent LED driver chip, which can be used in matrix LED headlights, daytime running lights, turn signals and other vehicle lighting equipment.
